Lost episode

Not to be confused with The Lost Mission (an add-on for Doom 3), or the PSX Doom: The Lost Levels (add-on to the PlayStation Doom TC). Lost episode or lost episodes can refer to the following mods:
 * The Lost Episodes of Doom
 * Doom: The Lost Episode
 * Doom the Way Id Did: The Lost Episodes
 * Torment and Torture Lost Episode: Fury of Fire